Re: [PATCH v2 3/3] leds: gpio: Support the "panic-indicator" firmware property

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Hi Ezequiel,

It would be good to update also leds-gpio bindings,
of course in a separate patch:

Documentation/devicetree/bindings/leds/leds-gpio.txt

Thanks,
Jacek Anaszewski

On 04/13/2016 08:08 PM, Ezequiel Garcia wrote:
Calling a GPIO LEDs is quite likely to work even if the kernel
has paniced, so they are ideal to blink in this situation.
This commit adds support for the new "panic-indicator"
firmware property, allowing to mark a given LED to blink on
a kernel panic.

Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
---
  drivers/leds/leds-gpio.c | 4 ++++
  include/linux/leds.h     | 1 +
  2 files changed, 5 insertions(+)

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index 61143f55597e..8229f063b483 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -127,6 +127,8 @@ static int create_gpio_led(const struct gpio_led *template,
  	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
  	if (!template->retain_state_suspended)
  		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	if (template->panic_indicator)
+		led_dat->cdev.flags |= LED_PANIC_INDICATOR;

  	ret = gpiod_direction_output(led_dat->gpiod, state);
  	if (ret < 0)
@@ -200,6 +202,8 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)

  		if (fwnode_property_present(child, "retain-state-suspended"))
  			led.retain_state_suspended = 1;
+		if (fwnode_property_present(child, "panic-indicator"))
+			led.panic_indicator = 1;

  		ret = create_gpio_led(&led, &priv->leds[priv->num_leds],
  				      dev, NULL);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 49adf9c6e326..1067fb5f9296 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -359,6 +359,7 @@ struct gpio_led {
  	unsigned 	gpio;
  	unsigned	active_low : 1;
  	unsigned	retain_state_suspended : 1;
+	unsigned	panic_indicator : 1;
  	unsigned	default_state : 2;
  	/* default_state should be one of LEDS_GPIO_DEFSTATE_(ON|OFF|KEEP) */
  	struct gpio_desc *gpiod;

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